21
BRIDGE TEST
Remove the bridge from the pressure control box and per-
form this test to determine if the bridge is functional. Refer
to
BRIDGE RECTIFIER REPLACEMENT,
page 25. Use
a continuity tester , such as multi–meter set on the X1
ohms scale.
Perform all tests in the chart. If the bridge fails even one
test, it must be replaced.
Fig 21–1 shows the position of the wires on the bridge. Us-
ing the chart at the right, connect the meter wires as indi-
cated by the black dots for each test, and then check the
continuity.
Fig 21–1
AC1
AC2 G2
G1
–
+
In Tests 1, 2 and 3, there should be NO continuity.
In Tests 4, 5 and 6, connect the + and – meter wires as in-
dicated, check continuity, then switch the meter wire con-
nections and check continuity again. You should get NO
continuity one way and YES continuity the other way.
In Tests 7 and 8, connect the meter wires as indicated by
the black dots. Touch the indicated “G” wire to one meter
wire, and then to the other. You should get NO continuity
one way and YES continuity the other way.
NO
D
D
TEST 1
NO
D
D
TEST 2
NO
D
TEST 3
YES
D
D
NO
D
D
YES
D
D
NO
D
D
YES
D
D
NO
D
D
YES
d
D
D
NO
YES
d
D
D
NO
BRIDGE WIRES
G2 G1
– +
AC1 AC2
OR
OR
TEST 5
TEST 6
TEST 4
TEST 7
TEST 8
CONTINUITY
